CN106372751A - Well logging predication method relative to paleo-water-depth index parameters - Google Patents

Well logging predication method relative to paleo-water-depth index parameters Download PDF

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CN106372751A
CN106372751A CN201610784428.9A CN201610784428A CN106372751A CN 106372751 A CN106372751 A CN 106372751A CN 201610784428 A CN201610784428 A CN 201610784428A CN 106372751 A CN106372751 A CN 106372751A
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depth index
water
paleo
paleao
index parameter
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罗劲
徐思煌
郭丽彬
舒畅
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Exploration and Development Research Institute of Sinopec Jianghan Oilfield Co
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Exploration and Development Research Institute of Sinopec Jianghan Oilfield Co
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Abstract

The present invention discloses a well logging predication method relative to paleo-water-depth index parameters, belonging to the basin analysis and petroleum geology field. The method mainly comprises the following steps: a, performing design and sampling according to the real geological condition, performing the elementary geochemistry test of samples of palaeo-lacustrine basin deep low area, and obtaining an actually measured paleo-water-depth index parameter Mn/Fe; b, reading corresponding well logging curve values of the measured samples, wherein the well logging curve values include the resistivity logging RT and the acoustic logging AC; c, building the functional relation among the paleo-water-depth index parameter Mn/Fe, the RT and the AC data; and d, obtaining a longitudinally continuous paleo-water-depth index parameter Mn/Fe curve, and performing error analysis. The well logging predication method relative to paleo-water-depth index parameters can fully employ the conventional well logging materials to predicate the depth of the palaeo-lacustrine basin depositional stage relative to the fossil water, although the predication result is equivalent to the elementary geochemistry method, the predication result is more economic and more practical. The well logging predication method relative to paleo-water-depth index parameters is applied in the jianghan basin jiangling depression and the pearl river mouth basin enping depression, and is high in practicability.

Description

A kind of logging prediction method of paleao-water depth index parameter relatively
Technical field
The present invention relates to basin analysis and oil-gas geology field, the well logging of more particularly, to a kind of paleao-water depth index parameter relatively Forecasting Methodology.
Background technology
Paleao-water depth recovers to be the important content of palaeoenvironment research and basin analysis, is also to determine ancient times sea level variability, Gu The key content of land restoration.
Many to the determination of paleao-water depth for a long time based on the biological marker with depth of water meaning, such as calcareous algae, to dwell in bottom have hole Worm and planktonic foraminifera, Corallium Japonicum Kishinouye group, mussel-shrimp and cocolith, these data are that the recovery of paleao-water depth provides useful letter Breath, achieved with lot of research.But, carry out paleao-water depth in the oil-gas bearing basin sedimentary formation to non-outcrop area and recover When, said method is generally very high to the dependency degree of rock core (sample), is therefore also difficult to continuously extensive to the development of a set of stratum Again, this research largely limiting paleao-water depth and application.
The gathering of element and dispersion have certain dependency with the depth of water (offshore distance), are element institutes during deposition The mechanical differentiation occurring, Chemistry Differentiation act on, biological physiology acts on, the result of biological chemistry action.A lot of macroelements, Trace element and ree have good indicative significance to paleao-water depth.Mn is in lake water often with mn2+Stable existence, only works as lake water Violent evaporation and make mn2+During concentration saturation, it just can precipitate in a large number, thus showing high level in rock；Fe is in deep water humidity ring Easily with fe (oh) in border3Colloid rapid precipitation, thus in deposit, the low value of mn/fe corresponds to deepwater environment, high level corresponds to shallow water Environment.But, limited it is difficult to obtain the consecutive variations in paleao-water depth longitudinal direction by element geochemistry number of samples, be unfavorable for The expansion of research work.
Between the reducing degree of sedimentary water body and the depth of water, there is close relationship.U belongs to actinidess, in the periodic table of elements Its easily oxidized property of position description, in deposition process, u is mainly enriched with by two ways: be 1. reduced simultaneously Deposit is enriched with and is 2. absorbed by organic and clay mineral；Th is that in nature radioelement, chemical property is more steady Fixed element, is not affected by diagenesis Late reformation and geochemistry process, and usually forms content relatively in coarse crushing leftover High deposition, and general content is relatively low in carbonate rock.Th/u embodies the oxidation-reduction quality of water body, so, permissible Carry out paleao-water depth recovery using u, th well logging.But, due to th, between clastic rock and chemical sedimentary rock, content is different, in order to pick Except the impact of lithology, the rock stratum that lithology need to be selected consistent is studied, and in plane with vertical on be not belonging to identical heavy The work area of hydrops body scope needs to analyze respectively, and the parameter of Adjustable calculation formula causes the loaded down with trivial details of calculating process.
Content of the invention
The technical problem to be solved in the present invention is for defect of the prior art, provides a kind of paleao-water depth index relatively The logging prediction method of parameter.
The technical solution adopted for the present invention to solve the technical problems is: a kind of well logging of paleao-water depth index parameter relatively is pre- Survey method, comprises the following steps:
1) it is designed sampling according to actual geological condition, element geochemistry test is carried out to sample, obtain actual measurement ancient Depth of water index parameter mn/fe；
2) corresponding log value is read to test sample point, including resistivity logging rt, acoustic logging ac；
3) set up the functional relationship between paleao-water depth index parameter mn/fe and rt, ac data: mn/fe=a*rt+b*ac+ c；
Mn/fe value, rt, ac are surveyed according to sample point, matching obtains paleao-water depth index parameter；
4) obtain being longitudinally continuous paleao-water depth index parameter mn/fe curve, and carry out error analyses.
By such scheme, described step 3) in matching when obtaining paleao-water depth index parameter, need sample point measured value is entered Row pretreatment, rejects the larger specific-assignment sampling point of deviation.
The beneficial effect comprise that: the inventive method can fully effectively utilizes Conventional Logs predicting Gu The lake basin sedimentation phase relatively ancient water body depth, predicts the outcome suitable with element geochemistry method, but more economic, practical property is strong.
Brief description
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the method flow diagram of the embodiment of the present invention；
Fig. 2 is predicting the outcome of the In Jianghan Basin Jiangling Depression mn/fe of the embodiment of the present invention；
Fig. 3 is predicting the outcome of the Zhujiangkou Basin Enping sag mn/fe of the embodiment of the present invention；
Fig. 4 is that the In Jianghan Basin Jiangling Depression of the embodiment of the present invention predicts the dependency relation between mn/fe and actual measurement mn/fe Figure；
Fig. 5 is that the Zhujiangkou Basin Enping sag of the embodiment of the present invention predicts the related pass between mn/fe and actual measurement mn/fe System's figure.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, with reference to embodiments, to the present invention It is further elaborated.It should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not used to limit Determine the present invention.
As shown in figure 1, the present invention's specifically comprises the following steps that
1) it is designed sampling according to actual geological condition, element geochemistry test is carried out to sample, obtain surveying mn/ fe；
2) corresponding log value is read to test sample point, including resistivity logging rt, acoustic logging ac (table 1, table 2)；
3) set up the functional relationship between paleao-water depth index parameter mn/fe and rt, ac data:
Mn/fe=a*rt+b*ac+c；
4) obtain being longitudinally continuous paleao-water depth index parameter mn/fe curve, carry out error analyses (Fig. 2～5).
Table 1 In Jianghan Basin Jiangling Depression sample spot mn/fe, rt, ac value
Table 2 Zhujiangkou Basin Enping sag sample spot mn/fe, rt, ac value
With specific embodiment, the present invention is described below.
Embodiment 1:
The present invention applies in In Jianghan Basin Jiangling Depression road 9 well, Hu2Jing, Jin6Jing.Mainly comprise the steps:
Mn/fe value, rt, ac are surveyed according to sample point, matching obtains paleao-water depth index parameter
Mn/fe=-0.085*rt-0.011*ac+4.850, r2=0.625
Carry out error analyses, prediction mn/fe=0.687* actual measurement mn/fe+0.272, r to predicting the outcome2=0.806.
Embodiment 2:
The present invention is in Zhujiangkou Basin Enping sag ep17-3-a well, ep12-1-b well, the application of ep18-3-c well.Main bag Include following steps:
Mn/fe value, rt, ac are surveyed according to sample point, matching obtains paleao-water depth index parameter
Mn/fe=-0.009*rt-0.037*ac+3.686, r2=0.561
Carry out error analyses, prediction mn/fe=0.777* actual measurement mn/fe+0.169, r to predicting the outcome2=0.768.
It should be appreciated that for those of ordinary skills, can be improved according to the above description or be converted, And all these modifications and variations all should belong to the protection domain of claims of the present invention.

Claims (2)

1. a kind of logging prediction method of paleao-water depth index parameter relatively is it is characterised in that comprise the following steps:
1) it is designed sampling according to actual geological condition, element geochemistry test is carried out to sample, obtain surveying paleao-water depth Index parameter mn/fe；
2) corresponding log value is read to test sample point, including resistivity logging rt, acoustic logging ac；
3) set up the functional relationship between paleao-water depth index parameter mn/fe and rt, ac data: mn/fe=a*rt+b*ac+c；
Mn/fe value, rt, ac are surveyed according to sample point, matching obtains paleao-water depth index parameter；
4) obtain being longitudinally continuous paleao-water depth index parameter mn/fe curve, and carry out error analyses.
2. the logging prediction method of relatively paleao-water depth index parameter according to claim 1 is it is characterised in that described step 3) when matching obtains paleao-water depth index parameter in, need sample point measured value is carried out pretreatment, reject larger special of deviation Sample point.
CN201610784428.9A 2016-08-31 2016-08-31 Well logging predication method relative to paleo-water-depth index parameters Pending CN106372751A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106991509A (en) * 2017-05-27 2017-07-28 重庆科技学院 Log Forecasting Methodology based on radial basis function neural network model
CN111475920A (en) * 2020-03-13 2020-07-31 中海石油深海开发有限公司 Method and system for acquiring ancient water depth of deep basin, electronic equipment and storage medium
CN111580183A (en) * 2020-06-29 2020-08-25 陕西工业职业技术学院 Method for carrying out deep quantitative reduction on ancient lake water

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106991509A (en) * 2017-05-27 2017-07-28 重庆科技学院 Log Forecasting Methodology based on radial basis function neural network model
CN111475920A (en) * 2020-03-13 2020-07-31 中海石油深海开发有限公司 Method and system for acquiring ancient water depth of deep basin, electronic equipment and storage medium
CN111475920B (en) * 2020-03-13 2023-03-14 中海石油深海开发有限公司 Method and system for acquiring ancient water depth of deep basin, electronic equipment and storage medium
CN111580183A (en) * 2020-06-29 2020-08-25 陕西工业职业技术学院 Method for carrying out deep quantitative reduction on ancient lake water
CN111580183B (en) * 2020-06-29 2021-10-12 陕西工业职业技术学院 Method for carrying out deep quantitative reduction on ancient lake water

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